<!-- 秒杀商品的 SKU 选择，和 s-select-sku.vue 类似 -->
<template>
  <!-- 规格弹窗 -->
  <su-popup :show="show" round="10" @close="emits('close')">
    <!-- SKU 信息 -->
    <view class="ss-modal-box bg-white ss-flex-col">
      <view class="modal-header ss-flex ss-col-center">
        <!-- 规格图 -->
        <view class="header-left ss-m-r-30">
          <image
            class="sku-image"
            :src="sheep.$url.cdn(state.selectedSku.picUrl || state.goodsInfo.picUrl)"
            mode="aspectFill"
          >
          </image>
        </view>
        <view class="header-right ss-flex-col ss-row-between ss-flex-1">
          <!-- 名称 -->
          <view class="goods-title ss-line-2">{{ state.goodsInfo.name }}</view>
          <view class="header-right-bottom ss-flex ss-col-center ss-row-between">
            <!-- 价格 -->
            <view class="price-text">
              {{ fen2yuan(state.selectedSku.price || state.goodsInfo.price) }}
            </view>
            <!-- 秒杀价格标签 -->
            <view class="tig ss-flex ss-col-center">
              <view class="tig-icon ss-flex ss-col-center ss-row-center">
                <text class="cicon-alarm"></text>
              </view>
              <view class="tig-title">秒杀价</view>
            </view>
            <!-- 库存 -->
            <view class="stock-text ss-m-l-20"> 库存{{ state.selectedSku.stock || state.goodsInfo.stock }}件 </view>
          </view>
        </view>
      </view>
      <view class="modal-content ss-flex-1">
        <scroll-view scroll-y="true" class="modal-content-scroll">
          <view v-for="property in propertyList" :key="property.id" class="sku-item ss-m-b-20">
            <view class="label-text ss-m-b-20">{{ property.name }}</view>
            <view class="ss-flex ss-col-center ss-flex-wrap">
              <button
                v-for="value in property.values"
                :key="value.id"
                class="ss-reset-button spec-btn"
                :class="[
                  {
                    'checked-btn': state.currentPropertyArray[property.id] === value.id,
                  },
                  {
                    'disabled-btn': value.disabled === true,
                  },
                ]"
                :disabled="value.disabled === true"
                @tap="onSelectSku(property.id, value.id)"
              >
                {{ value.name }}
              </button>
            </view>
          </view>
          <view class="buy-num-box ss-flex ss-col-center ss-row-between">
            <view class="label-text">购买数量</view>
            <su-number-box
              v-model="state.selectedSku.count"
              :min="1"
              :max="min([singleLimitCount, state.selectedSku.stock])"
              :step="1"
              activity="seckill"
              @change="onBuyCountChange($event)"
            ></su-number-box>
          </view>
        </scroll-view>
      </view>
      <view class="modal-footer">
        <view class="buy-box ss-flex ss-col-center ss-flex ss-col-center ss-row-center">
          <button class="ss-reset-button buy-btn" @tap="onBuy">确认</button>
        </view>
      </view>
    </view>
  </su-popup>
</template>

<script setup>
/**
 * 秒杀活动SKU选择，
 * 与s-select-sku的区别：多一个秒杀价的标签、没有加入购物车按钮、立即购买按钮叫确认、秒杀有最大购买数量限制
 * 差别不大，可以考虑合并 todo @芋艿
 */
// 按钮状态： active,nostock
import { computed, reactive, watch } from 'vue'
import sheep from '@/sheep'
import { convertProductPropertyList, fen2yuan } from '@/hooks/useGoods'
import { min } from 'lodash'
const emits = defineEmits(['change', 'addCart', 'buy', 'close'])
const props = defineProps({
  modelValue: {
    type: Object,
    default() {},
  },
  show: {
    type: Boolean,
    default: false,
  },
  // 单次限购数量
  singleLimitCount: {
    type: Number,
    default: 1,
  },
})
const state = reactive({
  goodsInfo: computed(() => props.modelValue),
  selectedSku: {},
  currentPropertyArray: [],
})

const propertyList = convertProductPropertyList(state.goodsInfo.skus)
// SKU 列表
const skuList = computed(() => {
  let skuPrices = state.goodsInfo.skus
  for (let price of skuPrices) {
    price.value_id_array = price.properties.map((item) => item.valueId)
  }
  return skuPrices
})

if (!state.goodsInfo.is_sku) {
  state.selectedSku = state.goodsInfo.skus[0]
}

watch(
  () => state.selectedSku,
  (newVal) => {
    emits('change', newVal)
  },
  {
    immediate: true, // 立即执行
    deep: true, // 深度监听
  }
)

const onBuy = () => {
  if (state.selectedSku.id) {
    if (state.selectedSku.stock <= 0) {
      sheep.$helper.toast('库存不足')
    } else {
      emits('buy', state.selectedSku)
    }
  } else {
    sheep.$helper.toast('请选择规格')
  }
}

// 购买数量改变
function onBuyCountChange(buyCount) {
  if (buyCount > 0 && state.selectedSku.count !== buyCount) {
    state.selectedSku.count = buyCount
  }
}

// 改变禁用状态
const changeDisabled = (isChecked = false, propertyId = 0, valueId = 0) => {
  let newSkus = [] // 所有可以选择的 sku 数组
  if (isChecked) {
    // 情况一：选中 property
    // 获得当前点击选中 property 的、所有可用 SKU
    for (let price of skuList.value) {
      if (price.stock <= 0) {
        continue
      }
      if (price.value_id_array.indexOf(valueId) >= 0) {
        newSkus.push(price)
      }
    }
  } else {
    // 情况二：取消选中 property
    // 当前所选 property 下，所有可以选择的 SKU
    newSkus = getCanUseSkuList()
  }

  // 所有存在并且有库存未选择的 SKU 的 value 属性值 id
  let noChooseValueIds = []
  for (let price of newSkus) {
    noChooseValueIds = noChooseValueIds.concat(price.value_id_array)
  }
  noChooseValueIds = Array.from(new Set(noChooseValueIds)) // 去重

  if (isChecked) {
    // 去除当前选中的 value 属性值 id
    let index = noChooseValueIds.indexOf(valueId)
    noChooseValueIds.splice(index, 1)
  } else {
    // 循环去除当前已选择的 value 属性值 id
    state.currentPropertyArray.forEach((currentPropertyId) => {
      if (currentPropertyId.toString() !== '') {
        return
      }
      // currentPropertyId 为空是反选 填充的
      let index = noChooseValueIds.indexOf(currentPropertyId)
      if (index >= 0) {
        // currentPropertyId 存在于 noChooseValueIds
        noChooseValueIds.splice(index, 1)
      }
    })
  }

  // 当前已选择的 property 数组
  let choosePropertyIds = []
  if (!isChecked) {
    // 当前已选择的 property
    state.currentPropertyArray.forEach((currentPropertyId, currentValueId) => {
      if (currentPropertyId !== '') {
        // currentPropertyId 为空是反选 填充的
        choosePropertyIds.push(currentValueId)
      }
    })
  } else {
    // 当前点击选择的 property
    choosePropertyIds = [propertyId]
  }

  for (let propertyIndex in propertyList) {
    // 当前点击的 property、或者取消选择时候，已选中的 property 不进行处理
    if (choosePropertyIds.indexOf(propertyList[propertyIndex]['id']) >= 0) {
      continue
    }
    // 如果当前 property id 不存在于有库存的 SKU 中，则禁用
    for (let valueIndex in propertyList[propertyIndex]['values']) {
      propertyList[propertyIndex]['values'][valueIndex]['disabled'] =
        noChooseValueIds.indexOf(propertyList[propertyIndex]['values'][valueIndex]['id']) < 0 // true 禁用 or false 不禁用
    }
  }
}

// 获取可用的（有库存的）SKU 列表
const getCanUseSkuList = () => {
  let newSkus = []
  for (let sku of skuList.value) {
    if (sku.stock <= 0) {
      continue
    }
    let isOk = true
    state.currentPropertyArray.forEach((propertyId) => {
      // propertyId 不为空，并且，这个 条 sku 没有被选中，则排除
      if (propertyId.toString() !== '' && sku.value_id_array.indexOf(propertyId) < 0) {
        isOk = false
      }
    })
    if (isOk) {
      newSkus.push(sku)
    }
  }
  return newSkus
}

// 选择规格
const onSelectSku = (propertyId, valueId) => {
  // 清空已选择
  let isChecked = true // 选中 or 取消选中
  if (state.currentPropertyArray[propertyId] !== undefined && state.currentPropertyArray[propertyId] === valueId) {
    // 点击已被选中的，删除并填充 ''
    isChecked = false
    state.currentPropertyArray.splice(propertyId, 1, '')
  } else {
    // 选中
    state.currentPropertyArray[propertyId] = valueId
  }

  // 选中的 property 大类
  let choosePropertyId = []
  state.currentPropertyArray.forEach((currentPropertyId) => {
    if (currentPropertyId !== '') {
      // currentPropertyId 为空是反选 填充的
      choosePropertyId.push(currentPropertyId)
    }
  })

  // 当前所选 property 下，所有可以选择的 SKU 们
  let newSkuList = getCanUseSkuList()

  // 判断所有 property 大类是否选择完成
  if (choosePropertyId.length === propertyList.length && newSkuList.length) {
    newSkuList[0].count = state.selectedSku.count || 1
    state.selectedSku = newSkuList[0]
  } else {
    state.selectedSku = {}
  }

  // 改变 property 禁用状态
  changeDisabled(isChecked, propertyId, valueId)
}

changeDisabled(false)
</script>

<style lang="scss" scoped>
// 购买
.buy-box {
  padding: 10rpx 20rpx;

  .buy-btn {
    width: 100%;
    height: 80rpx;
    border-radius: 40rpx;
    background: linear-gradient(90deg, #ff5854, #ff2621);
    color: #fff;
  }
}

.ss-modal-box {
  border-radius: 30rpx 30rpx 0 0;
  max-height: 1000rpx;

  .modal-header {
    position: relative;
    padding: 80rpx 20rpx 40rpx;

    .sku-image {
      width: 160rpx;
      height: 160rpx;
      border-radius: 10rpx;
    }

    .header-right {
      height: 160rpx;
    }

    .close-icon {
      position: absolute;
      top: 10rpx;
      right: 20rpx;
      font-size: 46rpx;
      opacity: 0.2;
    }

    .goods-title {
      font-size: 28rpx;
      font-weight: 500;
      line-height: 42rpx;
    }

    .price-text {
      font-size: 30rpx;
      font-weight: 500;
      color: $red;
      font-family: OPPOSANS;

      &::before {
        content: '￥';
        font-size: 24rpx;
      }
    }

    .stock-text {
      font-size: 26rpx;
      color: #999999;
    }
  }

  .modal-content {
    padding: 0 20rpx;

    .modal-content-scroll {
      max-height: 600rpx;

      .label-text {
        font-size: 26rpx;
        font-weight: 500;
      }

      .buy-num-box {
        height: 100rpx;
      }

      .spec-btn {
        height: 60rpx;
        min-width: 100rpx;
        padding: 0 30rpx;
        background: #f4f4f4;
        border-radius: 30rpx;
        color: #434343;
        font-size: 26rpx;
        margin-right: 10rpx;
        margin-bottom: 10rpx;
      }

      .checked-btn {
        background: linear-gradient(90deg, #ff5854, #ff2621);
        font-weight: 500;
        color: #ffffff;
      }

      .disabled-btn {
        font-weight: 400;
        color: #c6c6c6;
        background: #f8f8f8;
      }
    }
  }
}

.tig {
  border: 2rpx solid #ff5854;
  border-radius: 4rpx;
  width: 126rpx;
  height: 38rpx;

  .tig-icon {
    width: 40rpx;
    height: 40rpx;
    background: #ff5854;
    border-radius: 4rpx 0 0 4rpx;

    .cicon-alarm {
      font-size: 32rpx;
      color: #fff;
    }
  }

  .tig-title {
    font-size: 24rpx;
    font-weight: 500;
    line-height: normal;
    color: #ff6000;
    width: 86rpx;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
</style>
